raspberry pi - send email on startup (will need gmail account to send from)

startup_mailer.py

import httplib2
import os
import subprocess
import datetime
import oauth2client
from oauth2client import client, tools
import base64
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from apiclient import errors, discovery

SCOPES = 'https://www.googleapis.com/auth/gmail.send'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Gmail API Quickstart'

def get_credentials():
    home_dir = os.path.expanduser('~')
    credential_dir = os.path.join(home_dir, '.credentials')
    if not os.path.exists(credential_dir):
        os.makedirs(credential_dir)
    credential_path = os.path.join(credential_dir, 'gmail-python-email-send.json')
    store = oauth2client.file.Storage(credential_path)
    credentials = store.get()
    if not credentials or credentials.invalid:
        flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
        flow.user_agent = APPLICATION_NAME
        credentials = tools.run_flow(flow, store)
        print('Storing credentials to ' + credential_path)
    return credentials

def SendMessage(sender, to, subject, msgPlain):
    credentials = get_credentials()
    http = credentials.authorize(httplib2.Http())
    service = discovery.build('gmail', 'v1', http=http)
    message1 = CreateMessage(sender, to, subject,  msgPlain)
    SendMessageInternal(service, "me", message1)

def SendMessageInternal(service, user_id, message):
    try:
        message = (service.users().messages().send(userId=user_id, body=message).execute())
        print('Message Id: %s' % message['id'])
        return message
    except errors.HttpError as error:
        print('An error occurred: %s' % error)

def CreateMessage(sender, to, subject, message_text):
    msg = MIMEText(message_text)
    msg['To'] = to
    msg['From'] = sender
    msg['Subject'] = subject
    return {'raw': base64.urlsafe_b64encode(msg.as_string())}

def main():
    today = datetime.date.today()

    to = "to_address@gmail.com"
    sender = "from_address@gmail.com"
    subject = 'IP For RaspberryPi on %s' % today.strftime('%b %d %Y')

    # Very Linux Specific
    arg='ip route list |grep metric'
    p=subprocess.Popen(arg,shell=True,stdout=subprocess.PIPE)
    data = p.communicate()
    split_data = data[0].split()
    ipaddr = split_data[split_data.index('src')+1]
    my_ip = 'Your ip is %s' %  ipaddr

    msgPlain = my_ip
    SendMessage(sender, to, subject, msgPlain)

if __name__ == '__main__':
    main()

1. Complete Step 1, Step 2, and Step 4 of this QuickStart Guide (URL: https://developers.google.com/gmail/api/quickstart/python)
2. Save the attached python script above and run it
   % python startup_mailer
3. Follow johnantoni's crontab setup and reboot the raspberry pi.